import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

// This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage>
    with SingleTickerProviderStateMixin {
  late AnimationController _controller;
  bool flag = true;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      vsync: this,
      duration: const Duration(seconds: 6),
    )..repeat(reverse: true);
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Title'),
      ),
      floatingActionButton: FloatingActionButton(
        child: const Icon(Icons.refresh),
        onPressed: () {
          flag ? _controller.forward() : _controller.reverse();
          flag = !flag;
        },
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: [
            SlidingBox(
              controller: _controller,
              color: Colors.blue[200],
              curve: const Interval(0, 0.2),
            ),
            SlidingBox(
              controller: _controller,
              color: Colors.blue[400],
              curve: const Interval(0.2, 0.4),
            ),
            SlidingBox(
              controller: _controller,
              color: Colors.blue[600],
              curve: const Interval(0.4, 0.6),
            ),
            SlidingBox(
              controller: _controller,
              color: Colors.blue[800],
              curve: const Interval(0.6, 0.8),
            ),
            SlidingBox(
              controller: _controller,
              color: Colors.blue[900],
              curve: const Interval(0.8, 1.0),
            ),
          ],
        ),
      ),
    );
  }
}

class SlidingBox extends StatelessWidget {
  final AnimationController controller;
  final Color? color;
  final Curve curve;

  const SlidingBox(
      {super.key,
      required this.controller,
      required this.color,
      required this.curve});

  @override
  Widget build(BuildContext context) {
    return SlideTransition(
      position: Tween(begin: const Offset(0, 0), end: const Offset(0.3, 0))
          .chain(CurveTween(curve: Curves.bounceInOut))
          .chain(CurveTween(curve: curve))
          .animate(controller),
      child: Container(
        width: 220,
        height: 60,
        color: color,
      ),
    );
  }
}
